import store from '@/store/index'

export default class SocketService {
  //后端开启的ws端口
  static instance = null;
  static get Instance () {
    if (!this.instance) {
      this.instance = new SocketService();
    }
    return this.instance;
  }
  // 和服务端连接的socket对象
  ws = null;
  // 存储回调函数
  callBackMapping = {};
  // 标识是否连接成功
  connected = false;
  // 记录重试的次数
  sendRetryCount = 0;
  // 重新连接尝试的次数
  connectRetryCount = 0;
  //  定义连接服务器的方法
  connect (name) {
    // 连接服务器
    if (!window.WebSocket) {
      return console.log('您的浏览器不支持WebSocket');
    }
    let url = `ws://localhost:81/chat/${JSON.parse(localStorage.getItem('user')).name}`;
    this.ws = new WebSocket(url);

    // 连接成功的事件
    this.ws.onopen = () => {
      console.log('连接服务端成功了');
      this.connected = true;
      // 重置重新连接的次数
      this.connectRetryCount = 0;
    };
    // 1.连接服务端失败
    // 2.当连接成功之后, 服务器关闭的情况
    this.ws.onclose = () => {
      console.log('连接服务端失败');
      this.connected = false;
      this.connectRetryCount++;
      setTimeout(() => {
        this.connect();
      }, 500 * this.connectRetryCount);
    };
    // 得到服务端发送过来的数据
    this.ws.onmessage = msg => {
      let data = JSON.parse(msg.data)
      let obj = {
        data: {},
        type: Number
      }
      if (data.userNames) {
        //系统消息
        store.commit('SET_USERLIST', data.userNames)
        if (data.joinPerson != null) {
          store.commit('SET_JOINPERSON', data.joinPerson)
          obj.data = data.joinPerson
          obj.type = 1
          store.commit('ADD_TOTALlIST', obj)
        } else {
          store.commit('SET_LEAVEROOM', data.leavePerson)
          obj.data = data.leavePerson
          obj.type = 3
          store.commit('ADD_TOTALlIST', obj)
        }
      } else {
        obj.data = data
        obj.type = 2
        store.commit('ADD_TOTALlIST', obj)
        store.commit('SET_MSG', data)
      }
    };
  }
  // 回调函数的注册
  registerCallBack (socketType, callBack) {
    this.callBackMapping[socketType] = callBack;
  }
  // 取消某一个回调函数
  unRegisterCallBack (socketType) {
    this.callBackMapping[socketType] = null;
  }
  // 发送数据的方法
  send (data) {
    // 判断此时此刻有没有连接成功
    if (this.connected) {
      this.sendRetryCount = 0;
      try {
        this.ws.send(JSON.stringify(data));
      } catch (e) {
        this.ws.send(data);
      }
    } else {
      this.sendRetryCount++;
      setTimeout(() => {
        this.send(data);
      }, this.sendRetryCount * 500);
    }
  }

  close () {
    this.ws.close()
    this.ws.onclose = function (e) {
      console.log('用户主动退出！')
    }
    return true
  }
}

